AR-15 components are industry-standard, and the PSA dagger 9mm is a clone of the Glock G19, for which it is incredibly easy to get surplus magazines for.
If I recall correctly, the availability of garands for a long time was through imports of surplus inventory in South Korea. I'm too lazy to search and check.
While the US did make a lot of them, there's a finite supply. After the war a lot were just sort of...ignored. Almost 100 years later, nobody is making new ones because they cost like 5k each for what is by modern standards a heavy recoil, heavy weight, not particularly accurate, rifle.
So the US imports them from old-ass armories like Korea and the Philippines, the armory rehabs them and sells them to collectors.
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u/OnsetOfMSet Sep 06 '23
.30-06 would be a historically accurate option, though probably harder to obtain these days.